Best way to mirror data across two-node apache clusterI like the idea of just rsyncing between the two servers as the coding will often not change. The reason that I brought up GlusterFS and DRBD is for scalability in the future. But as quanta points out, isn't the NFS server a single point of failure? I can't afford another two servers to make a NFS cluster. But going back, my main reservation with rsync is what happens if I load balance and a user is directed to "newer" server and on the next refresh is sent to the "older" server?